Question!!!!!

During the last time my boyfriend and I tried to have sex I had this weird warm sensation in my vagina when he entered me, and at first we thought it could be a yeast infection but then I got my period. I am now off my period and I have no itching, funky smell or weird discharge so I am wondering what this heat could be?

* I have been on birth control for a month and I have been on Metformin for a month and a half

*Also I recently felt the warm feeling when I tried to insert a sex toy